﻿/*
 * Copyright 2013 ZXing.Net authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;
using System.Collections.Generic;

using ZXing.Common;

namespace ZXing.OneD
{
   /// <summary>
   /// This object renders a MSI code as a <see cref="BitMatrix"/>.
   /// </summary>
   internal sealed class MSIWriter : OneDimensionalCodeWriter
   {
      private static readonly int[] startWidths = new [] { 2, 1 };
      private static readonly int[] endWidths = new[] { 1, 2, 1 };
      private static readonly int[][] numberWidths = new[]
                                                        {
                                                           new[] { 1, 2, 1, 2, 1, 2, 1, 2 },
                                                           new[] { 1, 2, 1, 2, 1, 2, 2, 1 },
                                                           new[] { 1, 2, 1, 2, 2, 1, 1, 2 },
                                                           new[] { 1, 2, 1, 2, 2, 1, 2, 1 },
                                                           new[] { 1, 2, 2, 1, 1, 2, 1, 2 },
                                                           new[] { 1, 2, 2, 1, 1, 2, 2, 1 },
                                                           new[] { 1, 2, 2, 1, 2, 1, 1, 2 },
                                                           new[] { 1, 2, 2, 1, 2, 1, 2, 1 },
                                                           new[] { 2, 1, 1, 2, 1, 2, 1, 2 },
                                                           new[] { 2, 1, 1, 2, 1, 2, 2, 1 }
                                                        };

      /// <summary>
      /// Encode the contents following specified format.
      /// {@code width} and {@code height} are required size. This method may return bigger size
      /// {@code BitMatrix} when specified size is too small. The user can set both {@code width} and
      /// {@code height} to zero to get minimum size barcode. If negative value is set to {@code width}
      /// or {@code height}, {@code IllegalArgumentException} is thrown.
      /// </summary>
      /// <param name="contents"></param>
      /// <param name="format"></param>
      /// <param name="width"></param>
      /// <param name="height"></param>
      /// <param name="hints"></param>
      /// <returns></returns>
      public override BitMatrix encode(String contents,
                              BarcodeFormat format,
                              int width,
                              int height,
                              IDictionary<EncodeHintType, object> hints)
      {
         if (format != BarcodeFormat.MSI)
         {
            throw new ArgumentException("Can only encode MSI, but got " + format);
         }
         return base.encode(contents, format, width, height, hints);
      }

      /// <summary>
      /// Encode the contents to byte array expression of one-dimensional barcode.
      /// Start code and end code should be included in result, and side margins should not be included.
      /// <returns>a {@code boolean[]} of horizontal pixels (false = white, true = black)</returns>
      /// </summary>
      /// <param name="contents"></param>
      /// <returns></returns>
      override public bool[] encode(String contents)
      {
         var length = contents.Length;
         for (var i = 0; i < length; i++)
         {
            int indexInString = MSIReader.ALPHABET_STRING.IndexOf(contents[i]);
            if (indexInString < 0)
               throw new ArgumentException("Requested contents contains a not encodable character: '" + contents[i] + "'");
         }

         var codeWidth = 3 + length*12 + 4;
         var result = new bool[codeWidth];
         var pos = appendPattern(result, 0, startWidths, true);
         for (var i = 0; i < length; i++)
         {
            var indexInString = MSIReader.ALPHABET_STRING.IndexOf(contents[i]);
            var widths = numberWidths[indexInString];
            pos += appendPattern(result, pos, widths, true);
         }
         appendPattern(result, pos, endWidths, true);
         return result;
      }
   }
}